Rotary pump



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ROTARY PUMP. No. 471,280. Patented Mar. l22, 1892.

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UNITED STATES PATENT Fries.

BENJAMIN F. TABEB, OF BUFFALO, NEV YORK.

ROTARY PU M P.

SPECIFICATION forming part of Letters Patent No. 471,280, dated March 22, 1892'.

Application led May 16, 1891. Serial No. 392,942. (No model.)

To all whom t may concern:

Be it known that I, BENJAMIN F. TABER, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Im provements in Rotary Pumps, of which the following is a specification.

This invention relates to the type of rotary pumps in which a rotary piston cylinder or carrier is employed, which is arranged eccentrically in the casingand runs in contact with an abutment on one side of the casing. Among other purposes such pumps are used for pu m ping soap-makers stock, molasses, and other heavy liquids. These liquids often contain hard foreign substances, such as gravel, nails, Jac., which are liable to enter between the cylinder and the abutment, frequently injuring the parts of the pump and impairing its action and sometimes stopping` the pump.

The object of my invention is to overcome all liability of injury to the pump by foreign substances in the liquid; and it consists to that end in providing the movable pistons of the pump with buckets or receptacles, in which any foreign matter contained in the liquid is collected.

In the accompanying drawings, consisting of two sheets, Figure l is a longitudinal sectional elevation of my improved pump. Fig. 2 is 'a transverse vertical section thereof in line Fig. l. Fig. 3 is a similar section in line y y, Fig. 1. Fig. 4 is a fragmentary side elevation of the cylinder or carrier. Fig. 5 is an end view of the cylinder. Fig. 6 is a perspective View of one of the heads of the pu mp.

Like letters of reference refer to like parts in the several figures.

A represents the casing of the pump, having the usual suction-chamber B and dischargechamber C.

D is the rotating cylinder or carrier, arranged eccentrically in the casing, and c is the abutment, against which the adjacent side of the cylinder runs.

F are the movable pistons, attached to the cylinder and arranged in peripheral pockets or recesses G, formed in the cylinder. These pistons each consist of a curved longitudinal plate f, pivoted at its inner edge to the front wall of its pocket and provided at its outer free edge with an outwardly-extending bucket or receptacle f. These buckets are arranged on the front or advancing side of the pistons, and each bucket is composed of a longitudinal bottom plate f2, arranged at an angle to the piston-plate f and curved concentric with the pivot of the piston, end plates f3, and a longitudinal front-platefl. The pistons with their buckets are free to recede inwardly into their pockets in passing the abutment e and to move outwardly, so that the outer edges of their buckets run in contact with the inner surface of the case. The pockets G are made of the proper form to receive the bucket-pistons. The latter are preferably provided at their inner edges with cylindrical knuckles f 5, which are seated in correspondingly-shaped sockets g, formed in the' front ends of the pockets. hooks or lips g', which interlock with similar hooks or overhanging lips g2, which form the outer sides of the sockets, as represented in Figs. 2 and 3. The interlocking hooks of the knuckles and sockets are so arranged relatively to each other that the knuckles will be confined in the sockets in all positions of the pistons, so that the pistons must be attached to the cylinder before inserting the latter in the casing by swinging the pistons outwardly beyond their normal position.

I represen ts a stationary cam or projection arranged on one of the heads I of the pumpcasing o n the side of the cylinder opposite the abutment e, and whereby the swinging pistons are positively moved outwardly against the inner'wall of the case after passing the abutment and-in descending on the opposite side of the cylinder. As represented in Fig. 6, the cam I is formed on an annular rim or flange z', formed on the inner side of the head I and fitted in a circular slot j, formed in the adjacent end of the cylinder. The arms or solid portions k of the cylinder, which separate the pockets G, are provided with notches or recesses k', arranged in the path of the cam I, as represented in Figs. 3 and 4, and whereby the cylinder clears the cam. The shaft of the cylinder extends through theheads of the casing and is provided with the usual pulley for driving the cylinder. The pistons upon reaching the 'upper side of the cylinder and clearing the cam These knuckles are provided with I drop into their pockets by gravity, and they7 are retained therein by the abutment e until they have passed below the latter. They then gradually move outwardly by gravity and in ascending on the opposite side of the cylinder ride over the cam I, whereby they are positively moved outwardly until the outer edges of their buckets bear against the inner surface of the pump-casing. In passing from the suction-chamber to the discharge-chamber the pistons elevate the liquid and expel the same through the discharge-chamber in a Well-known manner.

Any solid foreign substances contained in the liquid, asgravel, nails, &c., which are of too high a specific gravity to be discharged with the current of liquid passing through the pump settle or gravitate in the buckets of the pistons, where they remain until they are removed, thereby preventing such solid substances from entering between the cylinder and the abutment and injuring the parts or interfering with the free action of the pump. The foreign accumulations which lodge in the piston-buckets are removed from time to time by inserting the hand through a hand-hole Z, arranged in the upper part of the pump-case and closed by a door or plate Z.

Vhile my improved pump may be used for pumping liquids of all kinds, it is especially desirable for pumping heavy liquids, such as soap-makers stock, molasses, &c.,which usually contain hard substances.

I claim as my inventionl. The combination, with the casing and thc rotary cylinder having a pocket or recess, of a piston arranged in said pocket and pivoted at its front or advancing end to the cylinder and provided at its outwardly-swingng rear end on its outer side with a receptacle in which foreign substances in the liquid are collected, substantially as set forth.

2. The combination, with the casing and the rotary cylinder having a pocket or recess, of a lswinging piston arranged in said recess and pivoted at its advancing end in the front end of said pocket and provided at its free rear end on its outer side with a receptacle composed of a longitudinal bottom plate proj ecting outwardly from the piston, end plates arranged at an angle to said bottom plate, and a longitudinal front plate or rim connecting the outer ends of said end plates, substantially as set forth.

3. The combination,with the casing, of a rotary cylinder provided with a peripheral pocket or recess having longitudinal Walls extending from the periphery of the cylinder inwardly toward the axis thereof, a lougitudinal socket formed in the front Wall of said pocket :near its outer edge, and a piston composed of a longitudinal plate adapted to bear against the front Wall of said pocket and having its outer longitudinal edge seated in said socket, and a receptacle formed on the outwardly-swinging rear end of the piston-plate, the bottom of said receptacle and the rear Wall of the pocket being curved concentric with the socket in the front wall of the pocket, substantially as set forth.

Vituess my hand this 153th day of May, 1891.

BENJAMIN F. TABEH.

YVituesses:

FRED. C. Garan, FRIEDRICH G'Usmv WILHELM. 

